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This is about the situation when a MediaStream [1] is a "media provider object" for a HTML media element. Looking at http://www.w3.org/TR/2015/WD-html51-20150417/semantics.html#media-data-processing-steps-list, there is no text that deals with what the Audio/VideoTrack object's id, kind and label attributes are set to. When the "media provider object" is a MediaStream, the MediaStreamTrack(s) [2] of the MediaStream have id, kind and label attributes, and the resulting AudioTrack(s) and VideoTrack(s) should inherit those properties. [1] http://w3c.github.io/mediacapture-main/#stream-api [2] http://w3c.github.io/mediacapture-main/#mediastreamtrack
HTML5.1 Bugzilla Bug Triage: Won't fix, the details of how MediaStream should handle or set any value for VideoTrack/AudioTrack should be fully detailed and covered in the Media Capture and Streams document. https://w3c.github.io/mediacapture-main/getusermedia.html#mediastreams-in-media-elements If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!